linux-kernel - Re: [PATCH v2 01/26] selftests/resctrl: Don't use ctrlc

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Date:   Tue, 28 Nov 2023 14:09:39 -0800
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        <linux-kselftest@...r.kernel.org>, Shuah Khan <shuah@...nel.org>,
        "Shaopeng Tan" <tan.shaopeng@...fujitsu.com>,
        Maciej Wieczór-Retman 
        <maciej.wieczor-retman@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>
CC:     <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 01/26] selftests/resctrl: Don't use ctrlc_handler()
 outside signal handling

Hi Ilpo,

On 11/20/2023 3:13 AM, Ilpo Järvinen wrote:
> perf_event_open_llc_miss() calls ctrlc_handler() to cleanup if
> perf_event_open() returns an error. Those cleanups, however, are not
> the responsability of perf_event_open_llc_miss() and it thus interferes

responsibility

> unnecessarily with the usual cleanup pattern. Worse yet,
> ctrlc_handler() calls exit() in the end preventing the ordinary cleanup
> done in the calling function from executing.
> 
> ctrlc_handler() should only be used as a signal handler, not during
> normal error handling.
> 
> Remove call to ctrlc_handler() from perf_event_open_llc_miss(). As
> unmounting resctrlfs and test cleanup are already handled properly
> by error rollbacks in the calling functions, no other changes are
> necessary.
> 
> Suggested-by: Reinette Chatre <reinette.chatre@...el.com>
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>

Reinette